WS3221

WS3221 Product Description WS3221 High Precision PSR Constant Current LED Driver Features ■ Built-in 650V Power MOSFET ■ ±5% LED Current Accuracy ■ Primary-side Sensing and Regulation Without TL431 and Opto-coupler ■ No Auxiliary Winding For Sensing And Supplying ■ Ultra low operating current ■ LED Open/Short Circuit Protection ■ External programmable LED Open voltage ■ CS Resistor Short Circuit Protection ■ VCC Clamp & under voltage lockout( UVLO) ■ Over Temperature Protection ■ Temperature compensation technology Applications ■ GU10 LED driver ■ LED spot light ■ Other LED lighting General Description WS3221 is a high precision primary-side feedback and regulation controller for LED lighting, it operates in constant current control mode and is designed to work in inductor current discontinuous conduction mode and especially suitable for flyback convertor under universal input. The output power of system is recommended to less than 7W. WS3221 integrates 650V power MOSFET. Since adopting primary sense and feedback control technology, the secondary sense and feedback circuit is eliminated. And it does not need the auxiliary winding for sensing the output current and supplying the chip. The low component counts and small system size are realized. Since using the high accurate current sense method, WS3221 realizes ±5% accuracy of LED current along with excellent line and load regulation. Advanced temperature compensation is applied to eliminate flicker of LED at high temperatu...